Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b3ccf8802f2674…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 12:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1237b870e8ccca9075df459b447a1a2 SHA-1: c52e925007feecbbf7d333c1b06a5801f3792a22 SHA-256: 53b3ccf8802f267414e9454c7f40d1d532a449f6df11b9ff21e5ba8d7b637335
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. No scripts were extracted, but the structure and embedded URLs strongly suggest a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://thelonerangerfanclub.com/ckfinder/userfiles/files/nolovanutuvanekaxuk.pdf In PDF document text
    • http://dalboncostruzioni.it/userfiles/files/65827584264.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c545849dc5---46895712711.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6l7aivlg3sbcomishiuknm7c72/14534461693.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1388408660bc8b11c49c9.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/sevopiz.pdfIn PDF document text
    • https://ienter.bg/files/90075644847.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/84886062438.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2b5ec43a---wiralidom.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/86626170301.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba1a79bf3a8cf33ddb02019c001a3e08/57084187632.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/22476630053.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wifevalepikodatiriponif.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/gigakosojopanuledax.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/2204805465.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/61562733653.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ee5914cbf9f389580d6dc063ace2ff76/juzetarelekeriwo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/58207a369584bea1f9eb93f54d0edeeb/25212868039.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/ralomat.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/19739389987.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vk3gannh1frb1rv7erctqt3hed/tuxeninufupagawumamezinu.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/xexegonalosusej.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6bd46cae5ef1234f16b0413c20ef0cb5/nolemejeroxixokow.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af86e827d35---51981558858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+searching+soul+plo+lumumba+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 17800 bytes
SHA-256: c387094719fb0c257f6420255df82b984d5909aff88e24bd803feb2bedb01721
font_01_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 11172 bytes
SHA-256: bfba14df5878d1e4b4ae9aec238840d475b961837836d125c051ec2302092f12
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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